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Enhance doNullMove for en passant and add related tests #45

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Merged
winapiadmin merged 5 commits into from
Mar 30, 2026
Merged

Enhance doNullMove for en passant and add related tests #45

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e8ff9ed
Update doNullMove to handle en passant state
winapiadmin Mar 29, 2026
73eb819
Apply clang-format
actions-user Mar 29, 2026
b457d38
Add tests for move, null move, and undo move
winapiadmin Mar 29, 2026
b754506
Update tests.cpp
winapiadmin Mar 29, 2026
0e69ea8
fix 1
winapiadmin Mar 29, 2026
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7 changes: 7 additions & 0 deletions position.h
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Original file line number Diff line number Diff line change
Expand Up @@ -182,6 +182,13 @@ template <typename PieceC = EnginePiece, typename = std::enable_if_t<is_piece_en

inline void doNullMove() {
history.push_back(current_state);
current_state.incr_sqs[0] = current_state.incr_sqs[1] = current_state.incr_sqs[2] = current_state.incr_sqs[3] = SQ_NONE;
current_state.incr_pc[0] = current_state.incr_pc[1] = current_state.incr_pc[2] = current_state.incr_pc[3] =
PieceC::NO_PIECE;
if (current_state.epIncluded)
current_state.hash ^= zobrist::RandomEP[file_of(ep_square())];
current_state.epIncluded = false;
current_state.enPassant = SQ_NONE;
current_state.turn = ~current_state.turn;
current_state.hash ^= zobrist::RandomTurn;
current_state.fullMoveNumber += (current_state.turn == WHITE);
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23 changes: 23 additions & 0 deletions tests.cpp
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Expand Up @@ -402,6 +402,29 @@ TEST_CASE("Experienced bugs in this repo") {
REQUIRE(p.zobrist() == p.hash());
REQUIRE(p.hash() == 4177524090105507023);
}
{
Position p;
p.doMove<false>(Move(SQ_A2, SQ_A3));
REQUIRE(p.zobrist() == p.hash());
p.doMove<false>(Move(SQ_B8, SQ_A6));
REQUIRE(p.zobrist() == p.hash());
p.doMove<false>(Move(SQ_F2, SQ_F3));
REQUIRE(p.zobrist() == p.hash());
p.doMove<false>(Move(SQ_F7, SQ_F5));
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REQUIRE(p.zobrist() == p.hash());
p.doNullMove();
REQUIRE(p.zobrist() == p.hash());
p.undoMove();
REQUIRE(p.zobrist() == p.hash());
p.undoMove();
REQUIRE(p.zobrist() == p.hash());
p.undoMove();
REQUIRE(p.zobrist() == p.hash());
p.undoMove();
REQUIRE(p.zobrist() == p.hash());
p.undoMove();
REQUIRE(p.zobrist() == p.hash());
}
{
Position p;
REQUIRE(p.getCastlingPath(WHITE, true) == 0x60);
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